Portable fire extinguisher



March 18, 1930. K. SCHMIDT PORTABLE FIRE EXTINGUISHER Filed @ug. 3, 1927 Patented Mar. 18, 1930 UNITED STATES KARL SCHMIDT, OI NEURUPPIN, GERMANY PORTABLE FIRE EXTINGIJ'ISHER Application-filed August 3, 1927, Serial No. 210,358, and in Germany August 7, 1926.

The invention relates to portable fire extinguishers and more particularly to the accommodation of cartridges or bottles containing liquid gases, such as carbonic acid, in fire extinguishers, as well as to a. device for holding and opening such cartridges or bottles.

If cartridges 0r shells containing liquid gases are inserted into fire extinguishers with a striking pin or other opening device directed upwards, gas escapes from the opened bottle for a short time only, because the outletopening of the bottle freezes up. This freezing up takes place for the reason that the expanding gas is not able to withdraw the necessary heat of evaporation from the air surrounding the cartridge present in the air space of the extinguisher.-

I avoid this drawback by inserting the cartridge or bottle into the extinguisher with the outlet opening directed downwards and im mersed in the extinguishing liquid stored in the apparatus. In this way the liquefied gas contained in the cartridge or bottle is obliged to pass into the extinguishing liquid in the 5 liquid state. The extinguishing liquid protects the cartridge against freezing and supplies the necessary heat of evaporation and the extinguishing liquid itself is cooled in consequence of this withdrawal of heat which has a favourable effect upon the extinguishing qualities of the liquid.

According to my invention the cartridge or bottle is not accommodated in a basket within the extinguisheras customarywith acid bottles and gas developing cartridges, but is suspended upside down from a rod which is passed outside through an airtight packing. This rod serves at the same time to push the cartridge against the bottom of the extinguisher so that a pin or the like is forced into the bottle and its outlet opened. Therod carrying the cartridge or bottle is preferably made in twoparts so that on the lower end of its upper portion guided in the stufling box a strikin p ate may be fixed when it is desired to use t is portion as striking pin in the ordina way when the extinguisher is 'to be equipped with an acid bottle or a gas develop- 0 'g cartridge instead of a cartridge contam- 5 ing liquid gas.

v with a squirting nozzle a' An embodiment ofthe invention is illustrated by way of example in the accompanying drawing.

The single figure of the drawing shows a longitudinal section through the improved extinguisher. i

Referring to the drawing a is the shell of the extinguisher filled with the extinguishing liquid to approximately the level n, b the squirting nozzle and a the cover closing. the

charge opening in the top of the extinguisher and in which the striking pin (5 is guided in the customary manner by a stufling box, m. The ordinary blow transmitting plate of this striking pin is unscrewed and in its place an extension rod 6 is screwed into the striking pin. Upon the free end of this extension rod I provided with screw thread is screwed a cupshaped holder f with internal screw thread into which is in turn screwed the bottom portion of the cartridge g. The length of the rod 0 is such that the pin or the like h for opening the outlet of the cartridge is situated near the dome-shaped bottom '5 of the extinguisher shell or casing. By a blow upon the 5 plate the cartridge is driven towards the 'bottom 2', its opening pin 71. comes in contact with the bottom and is forced into the neck of the cartridge or bottle whereby the latter is opened. I v Various changes and modifications may be made without departing from the spirit of my invention and I desire therefore, that only such limitations be placed on my claims as are imposed by the prior art.

I claim as my invention 2- I 1. In a portable liquid fire extinguisher, a container for the squirting liquid-provided with a charge opening in the topand a squirting nozzle, a cover for closing said opening,

a stufling box in said cover, a rod passing through said .stufiing box and adapted to be axially displaced from outside, a cartridge containing liquid gas and provided-with a striking pin suspended from the inner end of said rod so that said pin is located near the bottom of said container.

2. Ina portable liquid fire extinguisher a container for the squirting uid provided 1 bottom of said container.

in the top, a. cover for closing said opening, a rod passin tightly through said cover and adapted to e axially displaced from outside, an extension rod screwed on the inner end of said first rod and provided with a cup-shaped lower end, and a. liquid gas containin cartridge provided with a striking pin a apted to be screwed with its bottom into said cupshaped end of the extension rod so that said striking pin is located near the dome-shaped I afiix my signature.

' KARL SCHMIDT. 

